acidburns 532a9154b1 Calibrate battery ADC and document LiPo curve ...

- Add BATTERY_CAL config and debug logging for raw ADC samples
- Use LiPo voltage curve (4.2V full, 2.9V empty) for % mapping
- Document battery calibration, curve, and debug output in README

2026-02-13 23:57:18 +01:00

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